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A Review of Bird Ringing at the Knepp Estate 2015 - 2019

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A Review of Bird Ringing at the Knepp Estate 2015 - 2019 A Review of Bird Ringing at the Knepp Estate 2015 - 2019 Tony Davis, Connie Tremlett and Adham Ashton-Butt April 2020 Introduction Apart from a few nestlings, ringing commenced at Knepp on 14th August 2015 and has continued to the end of the period under review. Due to other commitments of the ringer in charge, effort is concentrated in the autumn and winter periods. As with any new ringing site, especially a large one, it takes time to learn what the opportunities are and which areas are most productive. In 2015 the primary ringing site was in the sallow scrub around the scrape in Brookhouse 8. This resulted in catches dominated by tits and leaf warblers (especially Chiffchaff). In 2016 we switched to the more diverse scrub in 27 Acres and continued to use this site in 2017. Part way through the autumn of 2018 we started to use New Barn 2 in combination with 27 Acres, although the latter site remained our primary area during the winter months. During 2019 we continued to utilise New Barn 2 and 27 Acres during the autumn although with perhaps a greater emphasis on New Barn 2. 27 Acres remained the primary site during the winter months. The weather has a significant impact upon ringing activities. Dry conditions and light winds are needed in order for the sessions to be safe for the birds and to be productive. Conditions during the autumns of 2016 and 2018 were excellent, with virtually no sessions lost. 2017 was very poor with unsettled weather throughout, leading to frequent lost sessions. There is a suggestion that prolonged unsettled weather in the late summer and autumn results in migratory species leaving the UK earlier and this did seem to be the case in 2017. In 2019 a couple of sessions were lost in August and the whole of October was very poor but the remainder of the period was good. Methodology The vast majority of birds were caught using mist nets operated from dawn to late morning in the autumn and from mid-afternoon to dark for roosts in the winter. Sound lures are used for selected species during the autumn and winter. These are only effective for some species and at Knepp they are mainly used for warblers, winter thrushes, finches and Swallows. The number of nets used has increased during the period under review, as trainees have become more experienced and proficient enabling a greater number of birds to be processed safely. However there are rarely more than five 18m nets used in New Barn 2 and six in 27 Acres. A small number of nestlings are ringed each year, mainly as a result of the British Trust for Ornithology (BTO) nest recording course. Unfortunately there has been insufficient time to enable more extensive nest recording to take place. Results Table One shows the annual ringing totals for each species at Knepp. The table excludes Barn Owls which are traditionally ringed by a ringer who is not part of the group. It is likely that the ringing of Barn Owls will transfer to our group in 2020. A total of 61 species were ringed during the period. Great caution should be exercised in drawing any conclusions about population changes from changes in the number of birds ringed. Apart from the different sites used in each year and the effects of weather on catching success or ringing activity, a number of other factors may have affected the number of birds ringed. Discussion of these factors can be found in the notes on selected species but in general, the most comparable years were 2018 and 2019. Table One : Number of each species ringed per year during the period 2015 – 2019. FG refers to fully grown birds, pulli are birds still in the nest or otherwise not yet capable of flight. 2015 2015 2016 2016 2017 2017 2018 2018 2019 2019 TOTAL FG Pulli FG Pulli FG Pulli FG Pulli FG Pulli Sparrowhawk 1 1 2 4 Kestrel 1 1 Lapwing 3 1 4 Woodcock 1 1 2 Stock Dove 0 Collared Dove 2 2 4 Turtle Dove 2 2 Cuckoo 4 4 Tawny Owl 1 1 Barn Owl 0 Kingfisher 2 2 4 Green Woodpecker 1 1 1 3 Great Spotted Woodpecker 1 1 2 1 5 Magpie 1 1 Jay 2 1 1 4 Jackdaw 3 1 5 9 Goldcrest 14 25 12 12 10 73 Blue Tit 91 74 84 169 9 140 36 603 Great Tit 24 50 24 62 43 6 209 Coal Tit 2 2 Skylark 2 2 4 Sand Martin 2 2 4 Swallow 35 28 36 1 4 104 House Martin 7 7 Long-tailed Tit 64 42 19 45 25 195 Chiffchaff 78 6 198 14 130 161 5 133 2 727 Willow Warbler 33 88 77 4 128 98 428 Blackcap 25 153 78 682 728 1,666 Garden Warbler 1 11 4 29 5 36 8 94 Lesser Whitethroat 29 5 10 5 70 73 192 Whitethroat 3 58 13 60 18 124 21 240 32 569 Dartford Warbler 1 1 Grasshopper Warbler 1 1 2 4 Sedge Warbler 1 1 7 8 4 21 Reed Warbler 2 17 4 10 7 24 20 84 Nuthatch 2 2 Treecreeper 1 2 1 5 5 14 Wren 2 31 16 29 26 104 Starling 1 1 Blackbird 11 30 4 15 7 15 9 32 123 Fieldfare 9 4 3 16 Song Thrush 4 18 5 6 8 13 18 4 76 Redwing 1 78 74 77 52 282 Mistle Thrush 1 1 Robin 5 27 9 16 29 4 32 12 134 Nightingale 2 4 4 5 13 28 Redstart 1 1 Stonechat 1 1 2 Dunnock 5 17 12 4 41 4 55 138 House Sparrow 2 2 Grey Wagtail 4 4 8 Pied/White Wagtail 12 12 Tree Pipit 1 1 Meadow Pipit 6 6 Chaffinch 1 3 1 4 4 13 26 Greenfinch 1 2 3 Goldfinch 19 17 5 9 4 54 Linnet 8 14 41 11 74 Lesser Redpoll 1 26 4 12 43 Bullfinch 11 9 13 8 2 43 Yellowhammer 2 2 4 Reed Bunting 4 4 Annual Totals 356 3 2 1,068 65 734 57 1,852 72 1,869 132 6,237 Notes on Selected Species Sparrowhawk Generally caught when they are hunting birds coming in to the winter thrush roost. Many escape from the nets before they can be extracted for ringing. Lapwing All ringed as chicks when they bred in Brookhouse 3, Tench Ford and the river restoration area. They do not appear to have bred in the last three years, probably due to a combination of habitat change and regional decline. In Sussex as a whole there was a 46% net loss of tetrads (2km x 2km squares) between the breeding surveys in 1988-92 and 2008-11 (Thomas, 2014) and there is no reason to suspect that this decline is not continuing. Woodcock Single birds ringed at a Redwing roost in Waterworks West and by lamping in Brookhouse 3. Remarkably, the latter bird was shot north-west of Moscow (see Recoveries section). Turtle Dove Considerable efforts have been made to catch adult birds for tagging in order to determine their preferred feeding areas and foodplants at Knepp. None of the techniques tried so far have been successful. The two birds ringed were nestlings in a nest found accidentally in 27 Acres. Any observations of Turtle Doves feeding at Knepp would be gratefully received by the estate Ecologist. Cuckoo Three of the four Cuckoos ringed in 2018 were tagged as part of the BTO’s tracking project (see https://www.bto.org/our- science/projects/cuckoo-tracking-project?gclid=EAIaIQobChMI96- By5LE5wIVRrTtCh3wZQK2EAAYASAAEgLUMfD_BwE). ‘Knepp’ successfully completed one full migration, wintering in Angola – as far south as British Cuckoos are known to go – before returning to Lee Barber of BTO with one of the satellite tagged Cuckoos Knepp on 25th April. Conditions in summer 2019 were clearly very challenging for British Cuckoos migrating south and Knepp appears to have perished in northern Spain in mid-July. ‘Raymond’ also completed one full migration, wintering in the Congo approximately 750km north of ‘Knepp’. Despite having a head start, Raymond’s migration north was late and slow and he did not return to Knepp until 22nd May, almost a full month later than ‘Knepp’. After having spent less than a month in the UK, Raymond departed on 20th June. Raymond’s southward migration was more successful than ‘Knepp’s’ but it seems that the same conditions prevented him from putting on sufficient fat to cross the Sahara and he is thought to have died in the southern Mauritanian desert in early August. The final Cuckoo ‘Lambert’ followed a similar pattern to ‘Knepp’, successfully migrating south to Angola and returning to Knepp on 8th May. He left on the evening of 17th June and made it as far south as Montpelier in southern France but he also succumbed to the tough conditions in southern Europe in 2019 and died in mid-late August. It is suspected that Knepp Cuckoos primarily parasitise Dunnocks but this has not yet been demonstrated. Goldcrest A scarce breeding bird at Knepp, being largely confined to plantation areas during the breeding season. Almost all birds are ringed in late autumn / winter when they disperse into deciduous scrub and woodland. They are probably migrants from further north or from the continent although this has yet to be proven from ringing recoveries at this site. Blue Tit and Great Tit The largest numbers are caught in mixed roving flocks.
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